// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using System;
using System.IO;
using System.Threading.Tasks;
using SixLabors.ImageSharp.Formats;
using SixLabors.ImageSharp.Formats.Bmp;
using SixLabors.ImageSharp.PixelFormats;

using Xunit;

namespace SixLabors.ImageSharp.Tests
{
    public partial class ImageTests
    {
        public class Load_FileSystemPath_UseDefaultConfiguration
        {
            private string Path { get; } = TestFile.GetInputFileFullPath(TestImages.Bmp.Bit8);

            private static void VerifyDecodedImage(Image img) => Assert.Equal(new Size(127, 64), img.Size());

            [Fact]
            public void Path_Specific()
            {
                using var img = Image.Load<Rgba32>(this.Path);
                VerifyDecodedImage(img);
            }

            [Fact]
            public void Path_Agnostic()
            {
                using var img = Image.Load(this.Path);
                VerifyDecodedImage(img);
            }

            [Fact]
            public async Task Path_Agnostic_Async()
            {
                using Image img = await Image.LoadAsync(this.Path);
                VerifyDecodedImage(img);
            }

            [Fact]
            public async Task Path_Specific_Async()
            {
                using Image<Rgb24> img = await Image.LoadAsync<Rgb24>(this.Path);
                VerifyDecodedImage(img);
            }

            [Fact]
            public async Task Path_Agnostic_Configuration_Async()
            {
                using Image img = await Image.LoadAsync(this.Path);
                VerifyDecodedImage(img);
            }

            [Fact]
            public void Path_OutFormat_Specific()
            {
                using var img = Image.Load<Rgba32>(this.Path, out IImageFormat format);
                VerifyDecodedImage(img);
                Assert.IsType<BmpFormat>(format);
            }

            [Fact]
            public void Path_OutFormat_Agnostic()
            {
                using var img = Image.Load(this.Path, out IImageFormat format);
                VerifyDecodedImage(img);
                Assert.IsType<BmpFormat>(format);
            }

            [Fact]
            public void WhenFileNotFound_Throws()
                => Assert.Throws<FileNotFoundException>(() => Image.Load<Rgba32>(Guid.NewGuid().ToString()));

            [Fact]
            public void WhenPathIsNull_Throws()
                => Assert.Throws<ArgumentNullException>(() => Image.Load<Rgba32>((string)null));

            [Fact]
            public Task Async_WhenFileNotFound_Throws()
                => Assert.ThrowsAsync<FileNotFoundException>(() => Image.LoadAsync<Rgba32>(Guid.NewGuid().ToString()));

            [Fact]
            public Task Async_WhenPathIsNull_Throws()
                => Assert.ThrowsAsync<ArgumentNullException>(() => Image.LoadAsync<Rgba32>((string)null));
        }
    }
}